Machine for extracting air bags



Augl, 1950 ac. KASTNER 2,517,438

MACHINE FOR EXTRACTING AIR BAGS Filed March l5, 1946 5 SheetS-Sheel 1ill INVENTOR. FDW/IRD C. ,VAST/YER,

All@ l, 1950 E. c. KASTNER 2,517,438

MACHINE FOR ExTRAcTING AIR BAGS Filed March l5, 1946 5 Sheets-Sheet 2Aug' 1, 1950 E. c. KASTNER 2,517,438

MACHINE FOR EXTRACTING AIR BAGS gg l JPLL j n INVENTO QW u J- ign/4,120@mism/m n BY @www www .sox

Aug. 1, 1950 E. c. .KAsTNER MACHINEFOR EXTRACTING 'AIR was 5Sheets-Sheet 4 Filed March l5. 1946 INVENToR. 50m/M10 C. MIST/V64? NonAg1,1950 E. c..KAsTNER 2,517,438

MACHINE FOR EXTRACTING AIR BAGS'- Filed March 15, 1946' -5 Sheets-Sheet5 zNVENToR. 50W/W0 C. WST/V5?.

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Patented Aug. l, 1950 MACHINE son nXrRAcfrINe :AIR BAGS Edward C.Kastner, Akron, .Oliio, assigner .to The Akron 'Standard Mold 'Ccmpany,Akron, Ohio, .a corporation of `Ohio Application March '155, 1946,Seria1`No.=654,770

(Cl. .11S-.2)

i6 Claims.

tubeiviiidhlis inserted into .a partially cured tire .f

casing when fthe 'latter @is pnt into a vulcanizinjg mold. The zair 'bagyis 'there inflated under :Pressure t'o force the |`casing=outwardlyiagainst `the mord :members 'When gthe tire is :subsequently`Withdrawn .from 'the mold, vthe :air rbag `must `be removedto enabletthesucceeding :manufacturing operations f'on the tire.

@ne of the difficulties lheretofore experienced in the 'extraction ofair trbags tfromtires has been '-in'the fprevention fof Ardamage ktothetire, caused by *the forcible dragging :of the .fair floa'g rover thehead Yrims. .si-Ieretofore the tire has l,been xdef'oil'm'ei Zat fsomeone point to `kink ithe 4air bag rl'adiallylinwardlyand the 'portion`Which vthusyex- "tended into :the open reenter of the Atire :wasgrasped iiyfappropriatemeans and: pulledaxially f fthe itire. Twofurther kinks were thus'producedf in the: air .hagwhere it was vforcedto" bend 'over wthfe 1`o`ead'rim. VAlthough 'made of 'rubber :orA2'mijner-like composition, the `:loa-g is :exceedinglyfstiff and:resistant .when kinks-d and 1 can easily @canse Ya permanent:distortion :of the f bead rimfand in'. .many Jcaseszwhilerbeingtdragged:from the tire, ractuallyilplledithe -fplies :away from lthe'tireilwall.The problemis 4especially'serions inthe case oftrunktires'f'wliere'alarge 7andloulkv airibag rnustheWithdrawrif.v through an opening'offsmalldiameten An loict' of the lpresent `invention :..is 2te provide amachine for removing air bags from tires, especially rtrunk times,vwithout determina "the `bead.ii'porticmCori injurin'gxthe adjacentplies.

' `To" accomplish this lobj'ect, 'a' support :for the tire isy"furnishedT which grips thefbead vrimsfan'd 'pulls them naxiallyfiapart, "and :means are pro- Fvisienlisfmaclefwherebyf.the.treadi'maythereafter fhe fpressed inwardly, 'progressively around the 'tirentoliree'inore'rand' more of 1 theabag from-the comitiement' of'theloeaidsfanolv allows it tobevi/ith drammiaxiallyffby= the I' hook:until i the entire A shag is removed..

:Another object. of vthe?.invention-,is to provide Jraf' simple "fandrugged mechanicali movement by means of Whichrone; member, isuehas theztread pressing member, rmayftae movedwinifassnhstan- -tially radialifdirection i. toward i a i :circular mem.-

ber., -such as a tire, `and .then circular path .peripherally of member.

A :further object is to .provide means whereby the mechanical .movement.may be adapted Ato various sizeslof circular members or tires.

Other objects and advantages of .the present invention will be`made.apparentpy the .following speeilicationandclaims and the appended`drawings.

sin `the drawings, Fig. I1 is .a .frontelevational View yof a tire .airbag removing machine ,embcdyingmy invention; ,Fia 2 is a View similar toFig. 1 but showing .aportion of .the .tire .support-r ing .mechanismswung to tire-.receiving position; Fig. -3 isahorizontalsection takenonthe .plane 3---3 l.of-.iiiaz Fig. A .is a verticalsectontakenontheplaneA-A of Fig. 1 .and illustratng\a tire in place and an air bagbeingremoved therefrom; Fig. 5isavertical section takenonthe plane 5.5of Fig.-.4; Fig.4 6 i isaivertical section taken on V.the ,offsetplanes- 6 of rFig.. 5.10ct Cshowing thepartsindifferent.relativeposition; and Fig. 'Iltis adia-.grammatic.illustrationoiv certainof the parts .and .their paths .of-movement- .In the drawingsfand particularly. in' Figs. l to `6, AI..haveillustrated.- apreferrediorm of my invenin .a substantially .the.circular Ition. A mainframe,.indicatedgenerally at il),

.carries f. a .hinged .support indicated. at 2l] npon y,wl-lich `V.thetire .T with its v.enclosed .air bag 'is ,placed as it.comes from .the.vulcanizen as shown in Figs. 2 and 3. The, support includes. aichuckilhwhichengagesione of the,.head rimsofthe tire IIhe tire `isthenlmanually-.swung,into the mach-ine, i to the `Abroken line ,position,of ,Fig J4, rwhere it is` engaged by avsecond...chuck 5i) whichgripsthe othertaead rim. .Apowerjrlevicellthen sseparatesthe two chucksto. .-.t

:'40 ,shown in full lines in- -Fig.4. .Withthev .tire in this openthegapbetween .dread rims, stretching .the .tire to .the form positionazpressurer devicell thenactsnpon the \.tread.of y. theytire. to.:bovvit radially .inwardlyI -to .er-ocizucefian inwand bulgeinttheainhagfB. A

Aien-eximaticaliy -operated hook ufisthen ,manually LAplaeednon thebulge-and caused todraw the air Zbagiromthextire. {Whilelthehook ispullingnpon ttheairbag,v a.l pair of-power.-actuatedlinkages. lfl

force*` a; pair-i ofA rollers againstr the `tread to-bow :it inwardlyyand then inove .the rollers in arcuate Imaths. .about the .tiretovforce the air yloag progres- .drawn-#from the rear of'thefmachinevloy thehook and theatire fis removed trom thefmachineby returningthe-rollersto-idle positiom-then releasing and then, after the support20 has been swung to its open position, releasing the chuck 30.

The main frame IE) comprises chiey a base II, a front wall I2, a rearwall I3, and tie members I4. The swinging tire support 20 comprises anarm y2| pivoted on a bracket 22 carried by the front wall I2, and anannular head 23 pivoted at 24 on the arm. In the open position,illustrated in Figs. 2 and 3, the head 23 is swung back against the armand thus exposes its inner face. A stop member 25 (Fig. 3) is providedon the arm to prevent the head from swinging in a closing direction morethan a predetermined amount relative to the arm and thus to transmit theforce of the pressure device 60 to the head for the bead stretchingoperation.

Referring now to the front bead chuck 3B, which is carried by the head23 and by means of which the tire is supported thereon, it will be seenin Figs. 2 and 4 that I provide three jaws 3| which may radially gripthe bead rim under the control of a manually operated cam plate 32. Topreserve the proper engagement with the tire despite variations in thediameter of the rims, I prefer to mount the jaws for parallel motion asshown. Each jaw is carried by three parallel arms 33, pivoted at one endto a cylindrical iiange 34 surrounding the central opening of the door,and pivoted at their other ends to the jaw. Each jaw is provided with asliding bar 35, having a pivotal connection at 36 with one of theparallel bars 33 and recip-rocable in a radial slot in the head. Theannular cam plate 32 is rotatably mounted on the head by means of aseries of rollers 31, and is formed with three spiral slots 38 forcoaction with cam-following rollers 39 on each sliding bar 35. A handle4i] is secured to the cam plate whereby the operator may rotate thelatter and thereby swing the jaws radially outwardly or inwardly toengage or disengage the tire. The individual jaws 3| are of the form ofcurved plates and are provided with outwardly hooked edges at 4| wherebythey may engage the inside face of the bead rim for the stretchingoperation later to be described. One of the jaws is arranged at the topof the head and thus forms a convenient support for the tire when thelatter is rstplaced on the machine in the position of Figs. 2 and 3, thetire being retained thereon by the hooked edge of the jaw while theoperator manipulates the cam mechanism to engage the remaining jaws.

With the tire securely in place upon the head, the arm 2|' and the headare swung upon their pivotal supports until the tire and head passthrough an opening in the front wall I2 and the tire engages the rearbead chuck 50. The rear chuck may be identical with the forward chuckjust described and in this case comprises three hooked jaws 5I each ofwhich is supported on a parallel motion linkage. 52 operable, throughsliding bars ,53, by a rotatable annular cam plate 54. These jawseffectively mask the bead rim, as best seen in Fig. 4, against theabrading action of the air bag. Being of substantial circumferentialextent, the lower two jaws 5I. best seen in Fig. 2, protect the vrim inthe regions of greatest destructive action. For the convenience of theoperator the control for the rear cam plate is brought to the frontofthe machine. This may conveniently be accomplished by means of a gearsegment 55 carried by the cam plate and meshing with a pinion 56 on ashaft 51 provided with a hand wheel 53 within reach of the operator. Bymeans of this cam control the rear jaws are swung radially inwardly,within the central opening 59 of the rear wall, to clear the tire beadrim and, after the tire is swung inwardly to the broken line positionT', of Fig. 4, the jaws are swung outwardly to hookingly engage the beadrim.

To allow the air bag B to be removed radially inwardly from the connesof the tire, the gap between the two bead rims is enlarged by forciblyseparating the front and rear chucks. This separation is convenientlyeffected by means of a hydraulic or pneumatic pressure device tilmounted on the front wall I2 and provided with a plunger 6I adapted topress outwardly on the arm 2|. The arm, by reason of the shoulder 25previously mentioned, swings the head 23 outwardly until the tire isstretched to the position indicated in full lines at T in Fig. 4.

While the tire has this stretched conguration, it is less rigid in aradial direction than before. Advantage is taken of this fact bypressing inwardly on the tread portion to eject the air bag from behindthe bead rims. Ejection of the air bag is initiated by localizedpressure on the tire tread to cause a single inward bulge of the airbag. This localized pressure may conveniently be obtained by means of ahydraulic or pneumatic device 'I0 comprising a cylinder ll mounted onthe base of the machine and provided with a ram 'I2 having an enlargedhead 13. At the proper time in the operation, the ram is caused to riseand lift the lowermost region of the tire to the dotted line position T0f Fig. 4 and the full line position of Fig. 5. An inward bulge or bowedportion B is thus produced in the air bag for engagement by the hook 8|]about to be described. Engagement by the hook prevents the bowed-inportion from returning into the tire and so the latter is allowed toregain its normal position, shown in full lines in Fig. 4, by exhaustingthe pressure under the ram 12.

The hook 8l), by means of which the air bag is withdrawn from the tire,comprises a curved arm 8| having a, slightly rearwardly directed freeend 82 for positive 'engagement with the air bag. The hook is rigidlycarried by an elongated piston rod 83 extending forwardly from an aircylinder 84. The cylinder is mounted, by means of trunnions 35, on aframework 86 secured to the base II. The rocking motion of the cylinderon its trunnions may be limited by stops 8'I to thereby maintain thehook in the operating region. The hook is provided with a handle 88 formanual placement in proper engagement with the air bag.

The piston rod 83 is freely rotatable upon its aXis and, when airpressure is not applied to the cylinder, is freely slidable in and outof the latter. Thus the operator may reach through the central openingin the door to grasp the handle and lift the hook upwardly and forwardlyover the air` bag and then downwardly into hooking engagement therewith.By `operating an appropriate valve, not shown, air pressure may then beapplied at the forward end of the cylinder to move the piston 89rearwardly and to place tension upon the air bag. The hook, therefore,withdraws the air bag from the tire as it is progressively released fromthe latter by means about to be described.

To eject the still confined remainder of the air bag from the tire, Iprovide means whereby a pair of rollers IIJ! may be brought intoforcible pressing engagement with the tread of the tire, adjacent theinitially contacted region, to increase the s. extent of the bowed-inportion B of the air bag, and whereby the rollers may then be 'for-cedin asubstantialiy arcuate path up and around the respective sides -ofthe tire to progressively 'eiect the fair bag therefrom. The hook 8.0,meanwhile,

continues' to draw the airbag through the central;

opening "59 of the'rearwall i3 and, as the `rollers approach'the upperregion of the tire, the airbag is suiciently released for completewithdrawal. The air bag is then dis-charged at the rear oi the machineand air pressure may loe applied to the rear end of the .air cylinderSil, by 'means of an appropriate valve not shown, to move the hookforwardly to an idle position ready for the next operation. l

"The 4means for operating A'the rollers il asy just described, comprisea pair vof ypower actuated linkages l. spects and so one, only, `will beydescribed.` roller lill is carried by the projecting ieg [192 of aTshaped carrier 6&3. To support thecarrier and to cause its roller todescribe the desired path, I have devised a mechanical movementcomprising a pair of rocking yokes m4 and to which the respective endsci the carrier cross har is@ are pivotally secured, as at l? and Eile.As pest seen 'in Fig. 6, the lower yoke e5 comprises a pair of rockerarms 09 freely rotatable on concentric trunnions il@ respectivelycarried by the front and rear walls of the frame.

The upper yoke mit constitutes the driving member of the linkage andcomprises a pair of arms al il drivingly keyed to a shaft H52 carriedlin appropriate bearings in the side walls. The shaft is forciblyoscillated, through gear and rack couple, by an appropriate power devicesuch The linkages may :be similar in all fre-v as a hydraulic orpneumatic cylinder, illustrated atv l'|3,'rigidly mounted .on the rearwall of the machine. The piston rod lit of the cylinder is adapte-d toreciprocate a rack iii? meshing with a gear i iii drivin-ely secured tothe i i 2. 'The rack 'is maintained in driving engagement with the gearby any suitable guiding means, not shown. f

By a proper choice A,ior the various' lengths and if and the shaft H2,and if the yokes -iiltgand iii-'i were of equal length, a true parallelroot-.ien would bc obtained and every point on the carrier im, includingthe center oi" the roller lill, would describe a circular are identicalwith that or the connection lill'. The roller could theneby be caused topress inwardly against a tire while traveling in a path concentric withthe :tine but other means would have to be inoorporated to cause theroller to forcibly approach the tire in the firstplace to withffl W itthe tire was to be removed.A This ability, or a true parallelogram, -tooperate .in the desired manner is due to the instabiy ity at thedead-center posi tion. Outside wouid he required to urge the lower yoketo the right or left as the upper yoke continued to the right, forexampie, and n the absence oi .such outside lmeans lower f yoke wouldlock.

The `appropriate path, or movement of the roller, including its feedingand wit-hdrawal,^may he ob tained by varying the-configuration ci thelinkage members slightlyfrom that of a parallel ogram. may be done byproviding ashorter yokefat 'H24 than' at L05., by .decreasing the spacoithe pivots lill and L08 below that of the trunnion and shaft, or by acombination of these two Avariations Thus, the essential feature is that.the sum of the pivot spacing on one yoke or arm and the A'pivot spacingon the frame is to be greater than thesum of the spacing on the otheryoke or arm and the spacing onthecarrier. This feature I haveillustrated for va .generalized case in thediagram ofFig. 7 where an.operating meme ber [5;0 iscarfried by a carrier ylli-I and is caused tooperate on a cir-cular article |52 along a path l53. The carrier issupported and moved by arms H34 .and 1'55, .thearm 154 being pivoted toa base at A andto the carrier .at B while the arm i5?, is povted tothebase at .C and to the carrier at D. As the arm .l 54 is swung in aclockwise direction from the position shown, the arm 155 follows it in,a generally parallel manner. The movement of the carriervis thussubstantially one` of trans lationand .the `center of the operatingmember ljll describes a ,substantially arcuate path As the arm ,E54 isswung' counterclockwise from thefposition shown, however, the arm .|55moves as'befo're., that is, in a clockwise direction. This retracing` ofits path is due to the fact that the distance AB-'l-BD is less than thedistance AC-l-CD The movement orthe `carrier at, this time is prefdominantly one of rotation and .the path Ili thus veers away from thecircular article in an abrupt manner.

'The portion v|57 vof the path lis ynot realized in practice, where onlythe .arm lnfi is power driven, as .the pivot D cannot go beyond lthelpoint i', but suchl portion is here illustratedto make apparentthenature of the generated curve.

` Having thus described the basis of the design, and returning to thepresent embodiment, it will be seen that my preferred form is that shownin the. drawings wherein the yokes vIifl and m5 are of equal lengthandthe spacing I [l1- i013 is smailer thanfthe spacing llt-l l2. `Thedifference of the 'tv/"cl spacings is small enough to cause the path VPof theroller center to depart only slightly from the circular as thelinkage moves downwardly from thebroken line position lil'to a position'such that the roller 'is at a point P in its path. Shortly thereafterthe pivot H38 reaches a' point |68' vin its circular path beyond whichit cannot go beca-use of the diminished spacing till-WEE. As theyokeHill then continues,`past dead center alignment with the point Hi8 andthe'shaft H2, the pivot iol continues downward` ly and to the right, asviewed in Fig. 5, while the pivot i538 is pulled upwardly .and to theleft." The result is a ciockwise tipping of the carrier W3 and theroller io'is withdrawn from the tire to its idle position, Shown in fullline.

` 'It has been convenient to describe the path of theroller as'itdescends from its upper limit, but it 'will .be understood thaty exactlythe same path is traversed in the opposite direction during the workingpart of the cycle. Thus, after the hook 81o has `been engaged with thepartially bowed-in air bag, an appropriate valve is actuated to energize:thepower device H3 and the `driving yoke tot moved thereby, in aclockwise direction from the full line position, to cause the roller topress iin-to the tire tread and bulge it inwardly to eject more of theair bag. The roller then moves upwardly at approximately the samedistance from the center of the tire, with the bulge in the treadprogressing with it, as illustrated at IUI'. The two rollers lill movesymmetric/ally at opposite sides of the tire and, as previouslymentioned, when they arrive at the upper limit of their strokes the airbag is completely released from the tire and lwithdrawn by the hook.

Settable means are provided whereby the m'achine may be conditioned toaccommodate different sizes of tires. As best seen in Fig. 5, the rollerlill is mounted in a yoke carried by a stem IZi. The stem is slidable ina bore in the leg |82. of the Carrier and may be adjustably extendedtherefrom, as shown, by means of a rack integral with the stem, and apinion |22 rotatably carried by the leg and provided with a hand wheel|23. Either the pinion or rack may be locked in adjusted position by anysuitable means not shown. When the roller is extended to the dotted lineposition, indicated at |24 in Fig. 5, the path P, travelled by theroller axis, is similar in form to the former path P but lies nearer theaxis of the tire. Thus, for any given size of tire a position of theroller, relative to the carrier, may be selected which will produce thedesired degree of deformation of the tire tread for the proper ejectionof the air bag.

Referring now to the removal of the tire from' the machine, it will beseen that the various steps performed during its engagement are to beperformed in reverse order, that is, the pressure device 50 isdeenergized, allowing the door 23 to swing inwardly and the tire toregain its unstressed position at T of Fig. 4. The hand wheel 58 is thenoperated to release the rear bead chuck and the door is swung open tothe position of Fig. 2. By means of the handle 40 the front bead chuckmay then be released and the tire lifted from its support on the upperchuck jaw.

While I have described a specic embodiment it will be apparent thatnumerous changes and modifications may be made within the spirit andscope of my invention. It will be apparent, for example, that themechanical movement which Ihave described need not be limited to use inconnection ywith the ejection of an air bag from a tire, but could beused to move a builing wheel over a selected area of a tire tread. Insuch a case the departure from the purely circular has a distinctadvantage in that the thickness of material removed would graduallytaper off at each end of the area and no undesirably sudden change ofcontour of the tire would result.

It will also be apparentl that numerous changes and modifications of theother mechanical features of the machine may be made within the purviewof my invention.

I claim:

1. In a machine for removing an air bag from a tire having bead rims anda tread, a frame, an axially xed bead chuck on the frame, aswinging-member pivoted on the frame, a second bead chuck carried by theswinging member and adapted to support a tire, the swinging member beingyadapted to move the tire into engagement with the rst-named chuck,power means adapted to swing the member away from the first-named chuckto thereby separate the bead rims and reduce the radial rigidity of thetire tread region, pressure means to bulge inwardly successive regionsof the tread to eject successive portions of theaair bag, and means toengage the air bag and withdraw it axially during the operation of thesaid pressure means.

2. In a machine for removing an air bag from a tire having bead rims anda tread; a frame; a bead chuck carried by the frame; an arm pivoted atone end on the frame; a second bead chuck pivoted at the other end ofthe arm and adapted to support a tire; means to limit the pivoting ofthe second-named chuck on the arm, the arm and second chuck beingadapted to carry a supported tire into engagement with the rstnamedchuck; power means adapted to swing the arm and, through the said pivotlimiting means, to swing the first chuck from the second chuck tothereby separate the bead rims and reduce the radial rigidity of thetread; pressure means to bulge inwardly successive regions of the treadto eject successive portions of the air bag; and means adapted to engagethe air bag and withdraw it axially from the tire.

3. In a machine for removing an air bag from a tire having bead rims anda tread; a frame; a bead chuck on the frame, said chuck comprising aplurality of hooked jaws adapted to hookingly engage one of the beadrims; a plurality of members radially slidable on the frame and eachoperatively connected to one of the jaws and carrying a cam follower; aselectively rotatable member provided with a plurality of cammedsurfaces for coaction with the cam followers; a second chuck adapted toengage the other bead rim of a tire; means for separating the chucks tothereby spread the bead rims and reduce the radial rigidity of thetread; pressure means adapted to bulge inwardly a portion of the treadto bow in a portion of the air bag; and means to engage the bowed-inportion and withdraw the air bag from between the separated rims andfrom the tire.

4. In a machine for removing an air bag from a tire having bead rims anda tread, a frame, means on the frame to separate the bead rims, aroller, a linkage to move the roller into pressing engagement with thetread and to roll it arcuately about the tire to eject radially inwardlysuccessive portions of the air bag, said linkage comprising a carrierfor the roller, a driving rocker arm pivoted at one point on the frameand at a second point on the carrier, a driven rocker arm pivoted at onepoint on the frame and at a second point on the carrier, the summationof (l) the distance between the two pivot points of the driving rockerarm and (2) the distance between the pivot point of the driving rockerarm on the carrier, and the pivot point of the driven rocker arm on thecarrier, being less than the summation of (1) the distance between thepivot point of the driving rocker arm on the frame, and the pivot pointof the driven rocker arm on the frame and (2) the distance between thetwo pivot points on the driven rocker arm.

5. In a machine for removing an air bag from a tire having bead rims anda tread, a frame, means on the frame to separate the bead rims, aroller, a linkage to move the roller into pressing engagement with thetread and to roll it arcuately about the tire to eject radially inwardlysuccessive portions of the air bag, said linkage comprising a carrierfor the roller, a driving rocker arm pivoted at one point on the frameand at a second point on the carrier, a driven rocker arm pivoted at onepoint on the frame and at a second point on the carrier, the summationof (1) the distance between the two pivot points of the driving rockerarm and (2) the distance between the pivot point of the driving rockerarm on the carrier, and the pivot point of the driven rocker arm on thecarrier, being less than the summation of (1) the distance between thepivot point of the driving rocker arm on the frame, and the pivot pointof the driven rocker arm on the frame, and (2) the distance between thetwo pivot points on the driven rocker arm, and means for adjusting thedistance of the roller from the line of the two pivot points on thecarrier.

6. In a machine for removing an air bag from a tire having bead rims anda tread, a frame, means on the frame to separate the bead rims, aroller, a linkage to move the roller into pressing engagement with thetread and to roll it arcuately about the tire to eject radially inwardlysuccessive portions of the air bag, said linkage comprising a carrierfor the roller, a driving rocker arm pivoted at one point on the frameand at a second point on the carrier, a driven rocker arm pivoted at onepoint on the frame and at a second point on the carrier, the summationof (1) the distance between the two pivot points of the driving rockerarm and (2) the distance between the pivot point of the driving rockerarm on the carrier, and the pivot point of the driven rocker arm on thecarrier, being less than the summation of (1) the distance between thepivot 10 point of the driving rocker arm on the frame, and the pivotpoint of the driven rocker arm on the frame, and (2) the distancebetween the two pivot points on the driven rocker arm, means foradjusting the distance of the roller from the line of the two pivotpoints on the carrier, and means toengage the bowed-in portion of theair bag and to axially withdraw the air bag while the linkage isoperating.

EDWARD C. KASTNER.

REFERENCES CITED The following references are of record in the file ofthis patent:

UNITED STATES PATENTS Number Name Date 1,683,736 Snyder Sept. 11, 19281,738,504 Stevens Dec. 3, 1929 1,853,146 Prentice et al. Apr. 12, 19322,241,807 Cotner May 13, 1941 2,244,162 Leguillon June 3, 1941 2,341,741Putnam Feb. 15, 1944 2,477,301 Kastner July 26, 1949 FOREGN PATENTSNumber Country Date 566,021 Germany Nov. 24, 1932

